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命名参数和可选参数是两个比较简单的特性，对于熟悉其他编程语言的开发者来说可选参数并不陌生，为参数提供默认值时就是可选参数：Pick out the Look at box by Just about every variety of file. (Be sure there’s almost nothing critical inside your Recycle Bin before emptying it.)B) Simply click/ta